Valve bag



April 21, 1953 c. H. HARTMAN VALVE BAG 2 SHEETSSHEET 1 Filed May 2, 1950INVENTOR. CARL H.HARTMAN.

ATTORNEYS.

April 21, 1953 c. H. HARTMAN VALVE BAG 2 SHEETSSHEET 2 Filed May 2, 1950l a i l \1 l INVENTOR. CARI- HlflAfiTMAN- 4; A TTORWEKS.

Patented Apr. 21, 1953 UNITED STATES PATENT orrlicsi VALVE BA'G Carl H.Hartman, New Rochelle, N.Y., assig'nor to St. Regis Paper Company, N ew.York, N. Y., a corporation of New York Applic'ation'May 2, 1950, SerialNo. 159,460

4:01aims. 1

This invention relates to valve bags and more particularly to bags ofthat type having valve sleeve means protruding from the valve corner andadapted to be folded and tucked in after the bag is filled.

While known forms of valve bags of the socalled tuck-in sleeve typeabove referred to have been widely and successfully used for the packingof various commodities, yet for certain very fine or dusty materials,there has been found to be some tendency for small amounts of thematerials to sift out through the tuck-in valve sleeve or be blown out,due to the bellows action of the bag when it isbeinghandled or shipped.While such losses of material through tuck-in sleeve valves areordinarily so small as to be unimportant, yet with certain chemicals orcolored materials, for example, such as fine pigments or the like, itbecomes desirable to substantially wholly preclude the possibility ofany of the material sifting or blowing out through the valve and toinsure that the valve sleeve will be in effect doubly sealed againstsuch losses, so that even small amounts of the, material will notescapeand disfigure the desired clean external appearance of the bag ordiscolor other articles or commodities which may happen to be nearbyduring shipment of the bags.

The present invention provides a simple, inexpensive and easilymanufactured tuck-in type valve sleeve arrangement which is effective ineliminating all noticeable sifting or blowing out of fine powdery orcolored materials at the valve corner. In accordance with theinvention,a double tuck-in type valve sleeve is provided, preferably, although notnecessarily, by utilizing a single supplemental sheet which is so foldedover as to form an inner sleeve wall and an outer sleeve wall, andpreferably also a sleeve cuff to embrace the inner edge of the usualvalve flap which is turned inwardly of the bag at the valve corner. Theinner sleeve wall preferably protrudes further than the outer sleevewall so that it may be readily and quickly grasped, then folded over andtucked in at least part way. Thegenerally shorter outer sleeve wall isso shaped at its end edges that same may then be readily folded over thetucked-in inner sleeve and finally both the inner and outer sleeve wallsas thus folded are further tucked in to the valve corner, wherebyprovision is made for a plurality of tight sleeve folds,- one or anotherof which will block the passage of even the smallest amount of material.

The invention is applicable to bags having one, two or more plies of;paper or other flexible or pliable sheet material, including. ifdesired, a ply or lining of polyethylene or other thermoplasticmaterial, and while the invention will be illus-' trated in connectionwith a multi-wall paper bag having its ends closed by a sewn seam, itwill be understood that certain features of the invention will also beadapted for use with valve bags of the pasted end-type.

Further and more specificobjects, features and advantages of theinvention hereof will appear from the detailed description given below,taken in connection with the accompanying drawings which form a part ofthis specification and illustrate by way of example aprefeiredxembodiment of the invention.

In the drawings:

Fig. 1(a) is a perspective view of the corner of a 'multi-wall paperbag, the corner being inturned for forming a valve of conventionalconstruction and of a type suitable for the application of the novelsleeve of the present invention;

Fig. 102) is a view showing the preferred form of double walled sleeveembodying the invention, before it is applied to the valve corner of abag;

Fig. 2 is a view showing the outline of a supplemental sheet in flatcondition adapted to be formed into a sleeve according to the invention;

Fig. 3 is a top view of the corner of a bag such as shown in Fig. 1(a)but with the corner spread apart and with the supplemental sheetinserted in position underneath thevalve flap, this supplemental sheethaving been folded over before insertion and being ready to be foldedoutwardly about the edge of the valve flap;

Fig. 4 is a side view of the construction of Fig.3 after the doublewalled sleeve area has been folded outwardly and the valve cornercollapsed;

Fig. its a view similar to Fig. 4, but showing a corner of the finishedsleeved valved bag with an end closure tape sewn in place; and

Figs. 6 and 7 show how the novel sleeve'is to be tucked in.

Referring now to Fig. 1 (a), there is here shown a conventional form ofvalve corner of a multiwall bag having opposed side walls as at I0, Illand a valve flap l I which has been turned inwardly about diagonal foldlines l2, l2. The particular bag-here shown is of the type havinggussets at its sides as at [3, although it will be understood that theinvention is applicable to socalled "flat or non-gusseted bags, ifdesired.

Referring to Fig. 1(b), the double walled sleeve is here shown as havingan inner wall constituted of opposed areas l4, 14', preferably of crepedpaper, and outer walls I15, 15 made integral with the inner walls byreason of. the folded-over cuff construction as indicated at [6.

3 The double walled sleeve, as shown in Fig. 1(b) may, is desired, beinserted in a valve corner, such as in Fig. 1(a), after the sleeve hasbeen folded to the shape here shown, and by hooking the cup portion l6over the inwardly directed valve flap edge l1. However, usually thesleeve will be formed and inserted in the manner hereinafter described.That is, first numerous supplemental sheets are cut out according to theoutline shown in Fig. 2 and preferably creased along fold lines as atl8, l9 and 20 and also, if desired, along the median line 2|. Suchsheets are then folded over along crease line it and the edge of thesleeve which includes this line is then inserted in under the valve flapedge I! in the manner shown in Fig. 3, while the mouth of the valve andthe valve corner are 'held in spread apart condition. The overlappingportions of the under ply of the valve flap, and of the supplementalsheet are sealed together as by a line of paste therebetween in theposition indicated at H (Fig. 3). Then the inner and outer sleeve wallsare both folded over (along fold lines I9,

) and about the inner edge ll of the valve flap,

whereby the cuff portion I6 is completed and the inner and outer sleevewalls protrude upwardly of the valve corner. Thereupon the spread-apartcorner of the bag may be collapsed about the median line 2| of'thevalve, and the parts will assume the positions shown in Fig. 4. Then theusual form of closure tape 22 may be applied to the end of the bag andsecured in the usual way as by a sewn seam 23.

(It will be noted that one of the. side areas, as at M, of the innersleeve may be cut at its outer end so that it will terminate and providean outer end edge 24, positioned at a slightly inwardly and upwardlydirected angle as compared with the edge of area M. This enables theareas I 3 and i l to be readily separated'by the fingers for insertionof a filling nozzle in the usual way.

'It will further be noted that with the preferred example shown, theupper outer corner portions of the outer'sle'eve wall are cut away alongdiagonal lines as'at25, 25, which lines are positioned preferably so asto be parallel with the diagonal fold lines I2, l2 of the valve corner,but spaced outwardly therefrom by a sufficient distance to permit thesleeve and parts to be folded and manipulated in the manner hereinafterdescribed. It will further be noted that the lower outer edge portionsas at 26 of the outer sleeve wall terminate at a region intermediatebetween the bag edge and the outer end edge of the inner sleeve wall.

After the bag has been filled and the filling spout is removed, theinner sleeve portion, together with the sewn end closure tape are firstfolded over and tucked in to the position approximately as shown at 21in Fig. 6, the outer sleeve Wall remaining for the moment protrudingsubstantially to the position shown at 28. Then the outer lower edgeportions of the outer sleeve wall are folded up over the areas at 21 andthe whole sleeve assembly is then folded downwardly and inwardly, intothe valve with the exposed parts then finally appearing substantially asat 2%) in Fig. 7. 7

It will be apparent that the diagonal cut-off portions at 25, 25' of theouter sleeve wall are such that ready access is had to the inner sleeve.wall for folding its outer corners over and then folding same downwardlyand inwardly with a rapid tuck-in movement. sleeve parts will stillprotrude at the top of the However, the innerbag by a distance indicatedat 30 (Fig. 6) sulficiently so that these portions can again be foldedin after the outer lower end edge portion of the outer sleeve wall hasbeen folded up onto the areas at 21.

The combination of folds thus made possible has been found to be quitesurprisingly effective in eliminating even small amounts of dusting orblowing out of fine particles contained in the bag, and the constructionis also well adapted to exclude from the bag troublesome small insectpests, as well as preventing the entrance of moisture, or the escape ofmoisture in case the commodity to be packed is one which should not beallowed to dry out.

While the invention has been described in detail with respect to aparticular preferred example thereof, it will be understood by thoseskilled in the art, after understanding the invention, that variouschanges and modifications may be made without departing from the spiritand appended hereto.

What is claimed as new and desired to be secured by Letters Patent is:

I 1. In combination, a bag having its corner portionturned inwardly toform a valve with an inwardly directed valve flap, a double walledtuckin type sleeve secured in said valve, both walls of such sleeveprotruding outwardly of the valve corner, the inner sleeve wallprotruding further than the outer sleeve wall and upper outer portionsof the outer sleeve wall end edge being out ofi to'facilitate readyaccess to the inner sleeve wall, the outer end of which is shaped andpositioned to permit folding same and tucking it into the outer sleevewall, the remaining outer end edge'portions of the outer sleeve wallprotruding far enough to then be folded over the tucked in inner sleevewall, and both walls protruding far enough from the bag corner to thenbe again folded under and tucked inwardly of the valve.

2. In combination, a. bag having its corner portion turned inwardlyalong diagonal fold lines to form a valve with an inwardly directedvalve fiap, a double walled tuck-in type sleeve secured;

in said valve, both walls of such sleeve protruding outwardly of thevalve corner, the upper portion at least of the inner sleeve wallprotruding further than the adjacent portions of the outer sleeve walland upper outer portions of the outer sleeve wall end edge being out offalong diagonal lines spaced outwardly of said first named diago-:

then be again folded under and tucked inwardly of the valve. V

3. In combination, a bag having its corner portion turned inwardly toform a valve with an inwardly directed valve flap, the end of the bagbeing closed by a sewn seam, a double walled tuck-in type sleeve securedin said valve, both of said sleeve walls being closed along their upperedges by said sewn seam, but the upper portion at least ofthe innersleeve wall protruding further than the adjacent portions of the outersleeve wall to facilitate ready access to the outer end of the innersleeve wall, the outer end of which is shaped and positioned to permitfolding thereof downwardly and tucking it part way inwardly of thevalve, the remaining outer end edge portions of the outer sleeve wallprotruding far enough to then be folded over the tucked in inner sleevewall, and both walls protruding far enough from the bag corner to thenbe again folded under and tucked inwardly of the valve.

4. In combination, a bag having a corner portion folded inwardly to forma valve with an inwardly directed valve flap, a supplemental sheetfolded over along the median line of the valve and also folded overalong a line adjacent the inner edge of said valve flap and transverselyof said median line to provide a double walled tuckin type valve sleeve,both walls of which protrude substantially outwardly beyond the bagwall, the inner end portions of said double wall sleeve being againfolded over to form a and embracing the inner edge of said valve flap,the upper por- 15 Number tion of the outer end of the outer sleeve wallterminating along a line intermediate the bag wall and the outer end ofthe inner sleeve wall, the latter being shaped and positioned to permitsame to be first grasped and tucked in independently of the outer wall,the protruding outer wall portions being of sufficient length to then begrasped and folded over the tucked in inner wall portions and then betucked into the bag.

CARL H. HARTMAN.

References Cited in the file of this patent UNITED STATES PATENTS NameDate Redington Apr. 15, 1930 Weaver Feb. 12, 1934 Du Bois Feb. 21, 1939

